Biomass gasification integrated with leaching pretreatment can be conducive to the sustainable energy system. In this work, the biochar gasification was studied from structure to reactivity with the consideration of leaching pretreatment. The biochar was prepared from raw and leached corn straw (CS) and corncob (CC) in a fixed bed reactor. The gasification was performed in thermogravimetric analyzer with the emphasis on kinetic parameters comparison and reactivity prediction. The carbon and pore structure were investigated to reveal gasification mechanism. The prediction procedure based on model-free method was proposed. From the results, compared with CS, leaching pretreatment reduced gasification reactivity of CC considerably according to reactivity index and reactivity prediction. The random pore model showed the best fitting performance. Furthermore, the leaching pretreatment reduced inorganics (mainly K) in CS and CC, and removed water-soluble organics (pectin) in CC. The active sites and surface roughness in leached biochar decreased accordingly. The CO₂ gasification can activate initial biochar after pyrolysis. Specifically, the specific surface area of mesopore increased by hundred times and more active sites were also generated. However, as the gasification proceeding, the active sites and the fractional dimensions changed insignificantly for both raw and leached biochar. The leaching pretreatment mainly promoted the micropore development during gasification. The pore structure evolution was consistent with the carbon structure, which appeared to be correlated with the kinetic analysis. The research gives new insight into structure-performance correlation of biomass gasification and provides the implication for sustainable energy system based on gasification technology.

生物质气化与浸出预处理相结合可以有利于可持续能源系统。在这项工作中，从浸出预处理的角度研究了生物炭气化从结构到反应性。生物炭是在固定床反应器中由生的和浸出的玉米秸秆（CS）和玉米芯（CC）制备的。气化在热重分析仪中进行，重点是动力学参数比较和反应性预测。研究了碳和孔结构以揭示气化机理。提出了一种基于无模型方法的预测程序。从结果来看，与CS相比，根据反应指数和反应性预测，浸出预处理显着降低了CC的气化反应性。随机孔模型显示出最佳的拟合性能。此外，浸提预处理减少了CS和CC中的无机物（主要是K），并去除了CC中的水溶性有机物（果胶）。浸出的生物炭中的活性部位和表面粗糙度相应降低。一氧化碳₂气化可以在热解后激活初始生物炭。具体而言，中孔的比表面积增加了一百倍，并且还产生了更多的活性位点。然而，随着气化的进行，无论是生料还是浸出的生物炭，其活性部位和馏分尺寸的变化都微不足道。浸出预处理主要促进了气化过程中微孔的发展。孔结构演变与碳结构一致，这似乎与动力学分析有关。该研究为生物质气化的结构-性能相关性提供了新的见解，并为基于气化技术的可持续能源系统提供了启示。